Minor fixed on tapiHelper.py to match Nokia's condition where line-side and client-side may be not mapped all the time.
Minor fixed on tapiHelper.py to match Nokia's condition where line-side and client-side may be not mapped all the time.

Change-Id: Icc816755ec54e43374781de533d38f53ddc5409f

oplinkoms/onos,gkatsikas/onos,gkatsikas/onos,opennetworkinglab/onos,gkatsikas/onos,opennetworkinglab/onos,oplinkoms/onos,oplinkoms/onos,gkatsikas/onos,oplinkoms/onos,oplinkoms/onos,opennetworkinglab/onos,gkatsikas/onos,oplinkoms/onos,oplinkoms/onos,opennetworkinglab/onos,opennetworkinglab/onos,gkatsikas/onos,opennetworkinglab/onos